7_String_Explosion.py

text = input().replace("  ", "").split()
alphabet = {chr(i): i - 96 for i in range(ord('a'), ord('z') + 1)}
total = []
for word_index in range(len(text)):  # for word in text
    tup = int(text[word_index][1:-1]), text[word_index][0], text[word_index][-1]

    current = 0
    for char in range(1, len(tup)):
        if char == 1:
            if tup[char].isupper():  # ДЕЛИМ
                first_lower = tup[char].lower()
                for upper_first_letter, place in alphabet.items():
                    if upper_first_letter == first_lower:
                        current += (tup[0] / place)
                        break
            elif tup[char].islower():  # УМНОЖАВАМЕ
                for lower_first_letter, place in alphabet.items():
                    if lower_first_letter == tup[1]:
                        current += (tup[0] * place)
                        break
        elif char == 2:
            if tup[char].isupper():  # МАХАМЕ от CURRENT
                second_lower = tup[char].lower()
                for upper_second_letter, place in alphabet.items():
                    if upper_second_letter == second_lower:
                        current -= place
                        break
            elif tup[char].islower():  # ДОБАВЯМЕ към CURRENT
                second_word = tup[char]
                for lower_second_letter, place in alphabet.items():
                    if lower_second_letter == second_word:
                        current += place
                        break
    total.append(current)
print(f'{sum(total):.2f}')